Truck and brake arrangement therefor



J y 1 9 c. L. EKSERGIAN 2,250,988

TRUCK AND BRAKE ARRANGEMENT THEREFOR Filed July 19, 1939 m 5 11/ f? a I 7 1 INVENTOR' 24 11 6ar0Zzz5-L. iisergz'an ATTORNEY Patent ed July 29, 1941 brakes outside the whee1s,.the section being taken thus held in proper relation to the axle 9 and the c on the line l-I of Fig. 2 looking in the direction brake disk 5.

1 which in turn support the wheel axle 4 carrying 20 as shown in P18. 3, and the corresponding end to follow irregularities r the rails. n the cylinder, 8, said ends at and 27 or the re- TRUCK AND BRAKE ARRANGEMENT THEREFOR Carolus L. Eksergian, Detroit, Mich., asslgnor to Budd Wheel Company, Philadelphia, Pa., a corporation of Pennsylvania Application July 19, 1939, Serial No. 285,271

9 Claims. (Cl. 188-153) The present invention relates to brakes. frame I, as indicated. The axles do not ro- More specifically, it relates to brakes of the tate, and the wheels 3 are mounted on suitable disk type, wherein brake shoes cooperate with the bearings carried by the ends of the respective face or faces of a. disk, and concerns inparticuaxles. This structure of the wheel truck itself, lar an adaptation of such type of brake to trucks 5 with the independently resiliently mounted of the kind disclosed in the application Serial No. wheels, is disclosed and claimed in the above 280,771, filedJune 23, 1939. identified case, and forms no part of the present In trucks of this kind, the vehicle wheels are invention, but is disclosed herein solely to illusprovided with independent springs, so that the trate how the brake mechanism is constructed wheels are independently resiliently mounted and lo and operated. have a certain me of independence and free- The brake mechanism forming the basis of the dom to adjust themselves individually to the rails present invention, comprises a brake disk 5, at or the roadway. This in turn makes it practicaltaohed to each wheel 3 in any suitable way, for ly impossible to employ the same type of disk instance, by securing it to the wheel hub. Fig. 1. brake which is used in the somewhat similar shows that these brake disks are located outsidetrucks which-are at present standard, wherein no the wheels, instead of between them, as in'thej EED such independent movement of the wheels is proformer type of truck wherein the wheels are not vided, and nothing interferes with the convenindependently sprung. tional location of the brakes. In order to provide means for forcing the The present invention accomplishes its purpose brake shoes against the faces of the brake disks 5, by locating the brake disks outside the wheels, init is highly desirable, if not nearly essential, that stead of between them, asformerly customary. such means should be capable of following the. This makes it desirable to modify both the operatdisks 5 in their up-and-down movements, caused ing means for the brakes and their mounting; and by the motions of the wheels 3 to which they are a preferred embodiment of the new structure is as rigidly secured. This is readily accomplished by disclosed by way of examplein the accompanying the brake yoke l I which at one end 12 has a bore drawing and described in the present specifical8 fitting pivotally on the reduced end it of the tion. axle 9, and at its other end It has a similar borev In the drawing: l8 fitting pivotally on a shaft H, which may be a Fig. 1 is a side elevational view, parts being reduced extension of the axle 8, exten outshown in section, of awheel truck having the ward from the brake disk 8. The yoke ii isof the arrows; In that portion of the yoke ll adjacent the Fig. 2 is a plan view of the truck, parts being 5 and I2, is located a double-acting br cylinder broken away; and I8 which houses two pistons, that move away Fig. 3 is a fragmentary elevation, on an enfrom one another when compressed air or other. larged scale, showing the brake mechanism in fluid under pressure is admitted to the cylinder detail. l8 through the port It, so as to enter between In all the figures, similar elements are desigsaid pistons. The end of one of these pistons is nated by the same reference characters. shown at 20, Fig. 3.

Referring to the drawing, I designates the At a suitablelocation in the yoke, there may be frame of the truck, in which are mounted the an enlarged portion 2|, which provides pivotal fixed axles 9, passing through the lugs 2. Upon support for the brake levers 22 and 23, which are a each axle 9 are mounted two arms or brackets l mounted on the bolts 24 and 25. The end 28 of i which are pivotally supported by said axle, and the lever 22 bears against the outer end of piston a wheel 3 at each end. Preferably the axles 4 are 2'! of the lever 23 bears against the outer end of universally mounted in said brackets, so that the oth r P o o Shown), 80 that when t the axles may tilt slightly, to permit the wheels said pistons are actuated by the pressure medium Each bracket I has a suitable receptacle 8 for Spective levers will move away from one another, the lower' end of a spring 8, whose upper end is thus causing the levers to. pivot about the bolts mounted in a cooperating receptacle l0, four of 24 and 25, to bring their other ends, 23 and 29, which are provided, one'at each corner of the closer together. v

The brake shoes so and 3| are carried by the kind, and are here shaped as sectors of rings.

Their precise shape and structure do not constitute an essential feature of the present invention.

In operation, it will be seen that the brake'arm II will follow the corresponding brake disk 5 in its vertical motions, produced by the rise and fall of the wheel 3 to which it is attached. This correspondence of motion is produced by reason of the fact that the arm H is pivoted about substan tially the same axis as the adjacent bracket 1.

To avoid binding, the bore [5 may be made slightly larger than the diameter of the shaft i1 over which it is engaged, so that the slight shift out of alinement that occurs when the axle l tilts will not cause any difficulty. There is also a slight increase in the axial distance between the axles l4 and 4 when the axle 4 tilts, and this must also be accommodated. This effect is also a slight one, and may likewise be provided for by a sufficiently loose fit between axle l1 and bore l6. When compressed air is admitted to the space between the brake pistons, through the port IS, the said pistons will be forced apart, thus causing the brake shoes 30 and 3| to engage the opposite faces of the brake ring 5. Since both pistons are identical in size, and are subjected to the same air pressure, their braking forces will also be. identical. Levers 22 and 23 are likewise identical, hence they automatically will maintain equality between the pressures exerted on opposite faces of the brake ring 5, and-hence produce equalized braking on the two faces of the ring, resulting in uniform dissipation of the kinetic energy of the vehicle, especially since all the wheels have identical brakes thereon, supplied with the same air'pressure.

While only one particular mbodiment of the invention has been disclosed in detail, it must be remembered that the drawing is highly diagrammatic and is presented'solely for illustrating the principles underlying the invention. Many features maybe modified in detail in various ways, and the invention is of course capable of many other embodiments, so that the same is not restricted to the features disclosed herein, but is defined solely in the following claims.

I claim:

1. In a wheel truck, a brake disk secured to the outside of one of the wheels. a unitary rigid arm pivoted at one end to the truck frame and having its other end pivotally mounted substantlally in axial alinement with the said wheel, and a brake shoe with fluid pressure actuating means therefor each carried by said arm, to cooperate with the rotary brake disk.

2. In a wheel truck having sprung wheels. a brake disk secured to the outside of one of the wheels, to rotate therewith, a unitary rigid arm pivoted at one end to the truck frame, and having its other end pivotally maintained substantially in axial alinement with the said wheel, and a brake shoe with fluid pressure actuating means therefor each carried by said arm, to cooperate with the rotary brake disk.

3. In a wheel truck, a rotary brake disc outside of, and secured to, one of the wheels. a unitary rigid arm pivoted at one end to the truck frame and having its other end pivotally mounted substantially in axial alinement with the said wheel.

a pair of brake shoes for engagement with opposite sides of said disc, a brake cylinder carried by said arm, said cylinder having two opposed pistons therein, and lever means actuated thereby to cause the shoes to bear against the rotary brake disc.

4. In a wheel truck, a brake disk secured to the outside of one of the wheels, a unitary rigid arm pivoted at one end to the truck frame and having its other end pivotally mounted substantially in axial alinement with the said wheel, a brake cylinder attached to said arm, and containing a piston, a brake shoe for engaging said disc, and means connecting said shoe to the piston whereby actuation of the piston will force the shoe against the rotary brake disk.

5. In a wheel truck having sprung wheels, a brake disc element secured to one of the wheels. to rotate therewith, a unitary rigid arm pivoted at one end to the truck frame, and having its other end pivotally maintained substantially in axial alinement with the said wheel, said arm having fluid pressure actuated means built thereinto, a brake shoe, and lever means connecting the said shoe to the said pressure actuated means,

to cause the shoe to bear against the rotary brake element.

6. In a wheel truck having independently sprung wheels mounted to swing about axes transverse to the'truck frame and, a brake element secured to, and located outwardly beyond, one of the wheels, to rotate therewith, said wheel having a prolongation of its axle extending out beyond it, a rigid arm pivoted at one end to the truck in substantial alignment with the axis about the wheel swings, and having its other end pivotaliy supported on said prolongation, substantially in axial alinement with the said wheel, and a brake shoe with actuating means therefor includinga lever and fluid pressure means for actuating said lever, carried by said arm, to cooperate with the rotary brake clement,

7. In a wheel truck having sprung wheels, a brake disk secured to one of the wheels, to rotate therewith, an arm pivotedat one end to the truck, and having its other end maintained substantially in axial alinement with the said wheel, said arm having double'actlng fluid pressure actuated means built thereinto, a pair of brake shoes, 10- cated adjacent opposite faces'of the disk, and means connecting the said shoes to the said pressure actuated means, to cause the shoes to bear equally against the faces of the rotary brake disk.

8. In a wheel truck having sprung wheels, a brake disk secured to, and located beyond. one of the wheels. to rotate therewith, said wheel having a prolongation of its axle extending out beyond it, an arm pivoted at one end to the truck. and having its other end pivotally supported on said prolongation. substantially in axial alinement with the said wheel, a double-acting brake cylinder built into the said arm, and brake shoes with actuating means therefor, carried by said arm, to cooperate withthe cylinderand with the rotary brake disk, to force the shoes against the opposite faces of the same when fluid pressure is applied to the cylinder.

9. In a wheel truck, a wheel and axle assembly connected at its opposite ends to the truck frame for independent vertical movement with respect thereto, said mounting being on a common trans- 2,250,988 'to the outside of said wheel and having lateral braking faces adjacent its periphery, a brake supporting arm hingedly connected at its opposite ends, respectively, to said axle extensionand the transverse pivot extension, said arm supporting brake shoes arranged to engage the 0p- CAROLUS L. EKSERGIAN. 

